# frozen_string_literal: true
require 'rails_helper'
RSpec.describe LinkDetailsExtractor do
subject { described_class.new(original_url, html, nil) }
let(:original_url) { 'https://example.com/dog.html?tracking=123' }
describe '#canonical_url' do
let(:html) { "" }
context 'when canonical URL points to the same host' do
let(:url) { 'https://example.com/dog.html' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq 'https://example.com/dog.html'
end
end
context 'when canonical URL points to another host' do
let(:url) { 'https://different.example.net/dog.html' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq original_url
end
end
context 'when canonical URL is set to "null"' do
let(:url) { 'null' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq original_url
end
end
context 'when canonical URL is set to "undefined"' do
let(:url) { 'undefined' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq original_url
end
end
end
context 'when only basic metadata is present' do
let(:html) { <<~HTML }
Man bites dog
HTML
it 'extracts the expected values from html metadata' do
expect(subject)
.to have_attributes(
title: eq('Man bites dog'),
description: eq("A dog's tale"),
language: eq('en')
)
end
end
context 'when structured data is present' do
let(:ld_json) do
{
'@context' => 'https://schema.org',
'@type' => 'NewsArticle',
'headline' => 'Man bites dog',
'description' => "A dog's tale",
'datePublished' => '2022-01-31T19:53:00+00:00',
'author' => {
'@type' => 'Organization',
'name' => 'Charlie Brown',
},
'publisher' => {
'@type' => 'NewsMediaOrganization',
'name' => 'Pet News',
'url' => 'https://example.com',
},
'inLanguage' => {
name: 'English',
alternateName: 'en',
},
}.to_json
end
shared_examples 'structured data' do
it 'extracts the expected values from structured data' do
expect(subject)
.to have_attributes(
title: eq('Man bites dog'),
description: eq("A dog's tale"),
published_at: eq('2022-01-31T19:53:00+00:00'),
author_name: eq('Charlie Brown'),
provider_name: eq('Pet News'),
language: eq('en')
)
end
describe '#language' do
it 'returns the language from structured data' do
expect(subject.language).to eq 'en'
end
end
end
context 'when is wrapped in CDATA tags' do
let(:html) { <<~HTML }
HTML
include_examples 'structured data'
end
context 'with the first tag is invalid JSON' do
let(:html) { <<~HTML }
HTML
include_examples 'structured data'
end
context 'with the first tag is null' do
let(:html) { <<~HTML }
HTML
include_examples 'structured data'
end
context 'with preceding block of unsupported LD+JSON' do
let(:html) { <<~HTML }
HTML
include_examples 'structured data'
end
context 'with unsupported in same block LD+JSON' do
let(:html) { <<~HTML }
HTML
include_examples 'structured data'
end
context 'with author names as array' do
let(:ld_json) do
{
'@context' => 'https://schema.org',
'@type' => 'NewsArticle',
'headline' => 'A lot of authors',
'description' => 'But we decided to cram them into one',
'author' => {
'@type' => 'Person',
'name' => ['Author 1', 'Author 2'],
},
}.to_json
end
let(:html) { <<~HTML }
HTML
it 'joins author names' do
expect(subject.author_name).to eq 'Author 1, Author 2'
end
end
end
context 'when Open Graph protocol data is present' do
let(:html) { <<~HTML }
HTML
it 'extracts the expected values from open graph data' do
expect(subject)
.to have_attributes(
canonical_url: eq('https://example.com/dog.html'),
title: eq('Man bites dog'),
description: eq("A dog's tale"),
published_at: eq('2022-01-31T19:53:00+00:00'),
author_name: eq('Charlie Brown'),
language: eq('en'),
image: eq('https://example.com/snoopy.jpg'),
image_alt: eq('A good boy'),
provider_name: eq('Pet News')
)
end
end
end